Baseline Experiments for the Modelling of Corrosion at High CO₂ Pressure Available to Purchase

The possibility for global climate change has sparked the interest in CO₂ removal from natural gas and other sources. Pipelines are considered for transportation of CO₂ from source to storage site. This can to a large extent be done in carbon steel pipelines as pure, dry CO₂ is essentially non-corrosive. However, if CO₂ removal is applied at a large scale, it will not be possible to dry it to a dew point well below the ambient temperature in all cases and there is a need to estimate the corrosion rate of water-wet pipelines at high CO₂ pressures. The present corrosion models cannot be used straight away, as they have been developed to cover a pressure range relevant for oil and gas transportation, i.e. CO₂ partial pressures up to 20 bar. The experiments carried out in this study show that the models overestimate the corrosion rate when they are used above their CO₂ partial pressure input limit. In some cases, the models predict more than 10 times the measured corrosion rate.